Glass-drawing apparatus



Aug. 24 1926.

G. G. ROBERTS GLASS DRAWING APPARATUS Filed August 2, 1923 314mm: or

Patented Aug. 24 i926.

lei N i i i2 T rh illll GEORGE ROBERTS, OF WASHINGTON,

DISTRICT OF COLUMBIA, Assreuoa 'ro via (XENIA PLATE GLASS CORPORATION. 01 WASHINGTON, DIS'IBECT OF COLUMBIA, A.

GOEPO'RATEON 0F VIRGINIA.

Application filed August 2, 1923.

This invention has relation to the art of drawing plate glass in the fiat. In drawing plate glass in the fiat, there is a tendency in the sheet to narrow at its lower end as the sheet ascends. It is the object of the present invention to so construct the crucilile from which the sheet is drawn that this tendency to narrow will be inhibited, as more fully hereinafter set forth.

In the drawing- Fig'. 1 is a plan view;

Fig. 2 is a longitudinal sectional view through one end; and

Fig. 3 is a through the middle part of a crucible constructed to carry out my invention.

In the drawing, I show a crucible of substantially oval or elliptical shape in horizontal section. Each rounded end-wall 5 is undercut, i. e., inclined outwardly toward the end of the crucible. these end-walls 5 is provided with a vertical groove 6. The bait, indicated in dotted lines at 7. is approximately the length of the mouth of the crucible. I

The bait is drawn slowly upwardly after having been dipped into the molten glass in the crucible, in the usual mannenby mechathe edges of transverse sectional view- GLASS-DRAWING Arenaarus.

Serial No. 655,286.

are'to guide the sheet as they form and ascend from the crucible, thus preventing twisting of the sheet. The undercut enclwalls of the crucible provide in excess of glass at the edges of the sheet which will prevent the sheet narrowing as it forms and ascends. i

I have'shown my invention applied to a crucible adapted to hold an individual batch ol;glass, but it will be understood that the invention may be applied to the well-known nism not shown. The grooves 6 continuous process 1. e., the process in which glass is continuously supplied to the cruci-' .ble, the crucible in that instance serving more in the nature of a nozzle than a crucible. 1

\Vliat I claim as new is: A glassrlrawing crucible of substantially elliptical form in horizontal section having' Centrally each of.

its end-walls undercut, i. e., inclined ontwardly toward the ends of the crucible, said end-walls each being provided with a cent ral vertical groove, for the purpose set .orth.

In testimony whereof I hereunto aiiix my signature.

i GEO. Gr. ROBERTS 

